Step 1:- Download Whatsapp From Here
Step 2 :- Install The Latest Version.
Step 3:-Ask any other WhatsApp user you know with the voice calling feature activated to call you via WhatsApp.(If Your Friend Don't Have This Feature Than Comment Your Number Publisher Call You In 24 Working Hours.)
How to enable WhatsApp voice calls (with root)
In case none of this is still working for you, there is another way for rooted users to force the feature onto their phones, but it is a bit of a pain, as you’ll need to be connected to your PC and open a terminal every time you want to WhatsApp call someone (until it is enabled permanently for you).Just open a terminal emulator and enter the following command:
su -c am start -n com.whatsapp/com.whatsapp.HomeActivity
